I suggest that you pass on the JVC HAFX101 as its bass is overdone and sounds artificial. Its drivers are only 8.5mm. For only around $16 on Amazon you can get the Sony MDR-EX210 which has 13.5 mm drivers and much deeper bass. The bass on the HAFX101 sounds like boosted upper and mid bass and not deep bass. For even more bass impact than the MDREX210 though is the MDR-XB60 for around $35 on Amazon. The MDR-EX210 has deep bass extension, however it doesn't seem exaggerated. On the XB60 and XB90 the bass probably sounds exaggerated(I haven't heard those yet). At first the sound of the Sony EX210 was thick and seemed to lack detail, but after very extensive burn in it is nice, and is giving more detail. Not as detailed as some of my other IEMs(like the Panasonic RPHJE355, JVC HAFX40, and Panasonic RPHJE450). The Sony XB90 doesn't seem to be sold in the US, and wonder if it is worth more than triple the price of the XB60. It is true the XB90 has 16mm drivers vs 13.5mm for the XB60, however based on my experience with the 13.5mm driver EX210, 13.5 mm drivers in an IEM can deliver deep bass. Perhaps you should buy the Sony EX210 and XB60 on Amazon for only around $50 for both.